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MAX32600 User’s Guide
System Configuration and Management
4.1 Power Ecosystem and Operating Modes
Trickle Charge Setting
Setting (8-bits)
No Diode, 4K Ohm series resistor
0xA7
Protection Diode, 250 Ohm series resistor
0xA9
Protection Diode, 2K Ohm series resistor
0xAA
Protection Diode, 4K Ohm series resistor
0xAB
If the Trickle Charger is enabled while USB power is available, the super capacitor will be charged using the USB power source. Otherwise, when enabled, the Trickle
Charger will charge the super capacitor from the main V
DD
supply.
Note
When using a super capacitor, the
MAX32600
cannot go into LP1 until the the super capacitor has been been sufficiently charged. Poll the V
RTC
Warning Level (user configurable) to set the appropriate level.
4.1.9
Low-Dropout Regulators (LDO)
4.1.9.1
1.8V LDO
The 1.8V LDO is the source of the V
REG18
rail and powers the digital core when in LP2: PMU and LP3: RUN. It can source power from either the USB supply or the
main V
DD
supply. If the USB supply is available, the 1.8V regulator will automatically switch to USB as its source. The 1.8V regulator supports a 50mA maximum
capacity (40mA maximum external capacity) over an input range of 2.2V to 3.6V and a 30mA maximum capacity (20mA maximum external capacity) over an input
range of 2.0V to 2.2V. Once the LDO input voltage reaches 1.95V and below, the V
REG18
output voltage will attempt to equal the input voltage. V
REG18
can be supplied
to external components, but the maximum external current should not be violated.
Retention Regulator
The Retention Regulator sources power to the V
REG18
power rail when the
MAX32600
is in LP1: STANDBY. Optionally, the Data Retention Regulator can be enabled
during LP2: PMU and LP3: RUN modes while the 1.8V LDO is enabled. No external loads should be placed on the Retention Regulator during LP1: STANDBY
while the 1.8V LDO is disabled. The Retention Regulator is only capable of maintaining data, so any external load may cause a power fail event to occur.
4.1.9.2
3.3V USB LDO
The 3.3V USB LDO sources its power from the 5V USB power and outputs 3.3V via V
DDB
. By default, the
MAX32600
will be powered from the USB supply when it
is available. To disable this, refer to
and
register fields.
Rev.1.3 April 2015
Maxim Integrated
Page 41
Содержание MAX32600
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